Dredging-machine



(No Model.)

2 Sheets-Sheet 1.,

W. H. BROWN & W. H. BELL.

DREDGING MACHINE.

Patented De0.19,'1882.

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(No Model.) I 2 Sheets-Sheet 2.. WQH. BROWN 81; W. H. BELL.

DR-EDGING MACHINE. No. 269,173. r Patented Dec. 19, 1882.

EYERs. PhoIwLflhngrnphBr. Washington, D. c

" UNITED STATES WlLLIAM BROWN AND WILLIAM H.

DREDGING- BELL, OF NEW ORLEANS, LOUISIANA.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 269,173, dated December19,, 1882 Application filedMay 4, 1882. (No model.) 7

in the parish of Orleans and State of Louisiana, have invented certainnew and useful Improvements in Dredging-Machines; and we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled. in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

This invention is designed as an improvement upon the apparatus or meansfor removingalluvialdeposits in rivers and other streams as shown anddescribed in the application filed by William H. Brown and William H.Bell on the 20th day of October, A. D. 1881, and allowed on November 11,A. D. 1881.

Our improvement consists in the novel construction of a cylinder mountedupon a shaft and provided with teeth or stirring devices,

constituting a revolving harrow.

Our improvement further consists in constructing a cylindrical skeletonframe composed ofstrips arranged spirally, so as to cross each other,and lining a portion of the outer endsof the cylinder, sothat thematerial raked or harrowed from the bed of the stream and held insuspension will be drawn inward at the center by the revolvingpropellers and forced outward at right angles to the current.

Our invention further consists in providing the longitudinally centralportion of 'the revolving harrows with a grooved pulley or collar toreceive an endless driving-chain.

Our invention further consists in the novel construction, combination,and arrangement of parts, as will be hereinafter more fully set forthand specifically claimed. a

In the accompanying drawings, Figure 1 shows a side elevation of thefront portion of a dredging-boat with our improvements attached theretofor removing the obstructions in a stream. Fig. 2 is a plan view of thesame, showing the propelling or driving means more fully. Fig. 3 is aperspective view of the revolving harrows with their adjuncts, and Fig.4 is a longitudinal sectional viewof a portion of the revolving barrows.

The letter A (see Figs. 3 and 4) represents a cylinder composed of twoseries of strips, a

b, which are arranged spirally in opposite directions, the series abeing provided with a plurality of fingers, arms, or teeth, 0.. Thesestrips are rigidly attached to the cylinderbands d in any suitablemanner, and these bands are supported upon theshaft B by means of thearms or spokes edattached to the hubs f, thus constituting or forming askeleton cylinder, which we term a revolving harrow.

The letter D represents cylindrical casings, which are arranged on theinside of the skeleton-cylinder frame, each occupying about onethird ofthe entire length of the skeleton cylinder, so as to leave anintermediate or middle latticeopen portion for the free ingress of thematerial held in suspension by the water, and which is to be dischargedsidewise through the open ends.

The fingers or teeth 0, which may be made of any suitable material andshape best suited for the purpose, are formed with screw-threads on theends to receive jam-nuts, by which they are secured in the strips of thecylinder and casing, and at the same time the jam-nuts act as bracing orstiffening means. (See Fig. 5.)

Mounted on the shaft B, and keyed or otherwise attached thereon, are thepropellers E, which may be made after any of the wellknown patterns.These propellers are arranged on the shaft within the cylindricalcasings D, so as to be protected from obstruction or rubbish, andproduce the desired effect of- I stantially the same as set forth in ourappliet-wheels, and driven by sprocket-chains pass- I in'g oversprocket-wheels on the ends of the shaft F, located on thedredging-machine.

The letter G represents an annulus or ringpulley embracing the cylinderand centrally arranged thereon. It is formed with a groove to receive achain or driving means extending to and operating in the grooved pulleyh, fixed on the shaft F, the object of this arrangement being to givethe cylinder revolution independently of the propellers, and, as will beobserved from the proportion of the drivingwheels, connecting the shaft.The cylinder has a slower motion than the propellers. This difference ofspeed creates the desired suction which draws the material loosenedthrough the openings of the cylinder and within the same, to bedischarged as hereinbefore described. Thejournals ot' the rotary harrowoperate in Outriggers, which are capable of beinglowered or elevated tosuit the condition of the work.

The operation and the motive power are,sub-

cation hereinbefore referred to.

We reserve the right to slightly vary the construction of the revolvingharrows and the means for operating the same, and to employ such motivepowers as may be deemed advisable and suitable for the purpose.

What we claim as our invention, and desire 0 to secure by LettersPatent, is-

1. A hollow cylinder for removing alluvial deposits, composed of thespirallyarranged strips, end lining-sections, and peripheral stirringdevices, with internally-arranged means for creating end currents,substantially as described.

2. In an apparatus for removing alluvial de- 45 3. A revolving harrow,constructed substantially as described, provided with thecentrallyarranged pulley for receiving the endless driving-chain,substantially as described, and for the purpose set forth.

. In testimony whereof we affix our signatures in presrnce of twowitnesses.

WILLIAM H. BROWN.

WVILLIAM HENRY BELL.

Witnesses: O. G. REB ENTISOH, KENTON RossER.

